Steel and Composite Structures

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Distortional buckling performance of cold-formed steel lightweight concrete composite columns

  • Yanchun Li (School of Civil Engineering and Communication, North China University of Water Resources and Electric Power) ;
  • Aihong Han (School of Civil Engineering and Communication, North China University of Water Resources and Electric Power) ;
  • Ruibo Li (Yuxing Construction Company) ;
  • Jihao Chen (School of Civil Engineering and Communication, North China University of Water Resources and Electric Power) ;
  • Yanfen Xie (School of Civil Engineering and Communication, North China University of Water Resources and Electric Power) ;
  • Jiaojiao Chen (School of Civil Engineering and Communication, North China University of Water Resources and Electric Power)
  • Received : 2023.10.19
  • Accepted : 2024.02.28
  • Published : 2024.03.25
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Abstract

Cold-formed steel (CFS) is prone to buckling failure under loading. Lightweight concrete (LC) made of lightweight aggregate has light weight and excellent thermal insulation performance. However, concrete is brittle in nature which is why different materials have been used to improve this inherent behavior of concrete. The distortional buckling (DB) performance of cold-formed steel-lightweight concrete (CFS-LC) composite columns was investigated in this paper. Firstly, the compressive strength test of foam concrete (FC) and ceramsite concrete (CC) was carried out. The performance of the CFS-LC members was investigated. The test results indicated that the concrete-filled can effectively control the DB of the members. Secondly, finite element (FE) models of each test specimen were developed and validated with the experimental tests followed by extensive parametric studies using numerical analysis based on the validated FE models. The results show that the thickness of the steel and the strength of the concrete-filled were the main factors on the DB and bearing capacity of the members. Finally, the bearing capacity of the test specimens was calculated by using current codes. The results showed that the design results of the AIJ-1997 specification were closer to the experimental and FE values, while other results of specifications were conservative.

Keywords

Acknowledgement

The authors are sincerely appreciated for the National Natural Science Foundation of China (No. 51878055), Key Scientific Research Projects of Universities (23A560011), Key Scientific Research Projects of Universities (22A560013).

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